Multi-metal sulfide pre-blend combination on the tribological performance of the brake friction material

Abstract

Purpose The purpose of this study is the influence of various combinations of metal sulfides on the tribological performance of brake pads. Design/methodology/approach Three brake pads were prepared using the possible combination of any two of the solid lubricants from Bismuth trisulfide (Bi2S3); Tin disulfide (SnS2) and Antimony trisulfide (Sb2S3) are chosen and blended with molybdenum disulfide and graphite. The tribological performance was compared with the brake pad containing aftermarket sulfide mixture. The tribological performance parameters such as performance coefficient of friction, fade percent, recovery percent, wear thickness loss, time is taken to reach the maximum temperature and fluctuation of friction were investigated using Chase tribometer adopting IS 2742 Part-4 (1994) test procedure. Findings The friction stability of the brake pad with 4Wt% of MoS2, Bi2S3 and SnS2 was observed to be better, but it showed poor wear performance and aggressive towards the rotor, whereas the brake pad contained 4Wt% of MoS2, Bi2S3 and Sb2S3 exhibited improved wear performance. Originality/value This paper explains the influence of the combination of multiple metal sulfide in the tribological performance of the copper-free brake friction composite. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-07-2020-0249/

Transfer film formation and dissipation and its effect on friction coefficient in NAO friction materials containing FeS2 lubricant

“…To balance the overall content of the friction material with changes in the FeS 2 content, adjustments were made to the filler component, which was considered to have a minor influence on the friction material properties. For practical applications of the friction material in the car industry, many brake pad manufacturers add metal sulfides such as MoS 2 , FeS 2 and Sb 2 S 3 as lubricating components because graphite alone as a lubricating component causes a lack of stable friction coefficient at various temperatures (Sathickbasha et al, 2021;Jamasri et al, 2021). The lubricant component, which is the main focus of this study, is considered to maintain stable friction coefficients and enhance wear resistance, and the solid lubricant FeS 2 was used in this study (Hu et al, 2012a(Hu et al, , 2012bLi et al, 2023).…”

Exploring the Interactive Effects of ZDDP, Metal Sulfides, and Carbon Nanotubes on the Lubrication Performance of a PAO Oil

“…Moreover, Bi 2 S 3 has been employed as a grease additive in metal forming applications, enhancing load carrying capacity in reciprocant tests [25]. Bi 2 S 3 also demonstrates synergistic effects with MoS 2 , as investigated by Sathickbasha et al [26,27] in brake pad applications and by Bao et al [28] in Al 2 O 3 contacts. Similarly, our research group has also worked on Bi 2 S 3 /MoS 2 composite soft coatings under variable humidity levels, reporting durability enhancements of up to 760% in coatings comprising 50% Bi 2 S 3 and 50% of MoS 2 [29].…”